New 502 Bad Gateway

PiBa

vnstat as used by TrafficTotals is normally started by a cron job every 5 minutes.. So somehow it doesn't finish within that time and another process is started..
I don't think its the cause of trouble by itself, but it might help find what is..

It could be interesting to know why vnstat is apparently 'hanging'.. perhaps output of truss when starting it manually, or lsof could help find that out.. The output files and results of these commands could help find a reason or direction to dig further, preferably combined with the other commands previously requested..:


lsof > /root/lsof_truss.log
truss -dfo /root/vnstat_truss.log vnstat -u

cat /root/lsof_truss.log | grep vnstat

That truss command may hang just like the other vnstat processes though.. Keep the log, then 'killall vnstat' and run the truss command again to a second logfile. Check if it hangs again, and maybe compare the last parts of both vnstat_truss.log files.. or upload em on the forum or perhaps a pm.?.

lsof might need to be installed.. 'pkg install lsof'
Also for those with TrafficTotals installed and active monitoring (and alerting?), please try and gather the info as soon as possible after there is >1 vnstat process running.

Sorry for asking again for 'more info', but without a reproduction, or this kind of trouble on my own machines, and afaik still unknown root cause it cannot be easily solved.. Just trying to help get to the root cause.. 8)

p.s. i'm just a pfSense-user (and package developer though usually not of pfB)..

gsmornot

Back to 502 Bad Gateway every 24 hours. (roughly) I am on the latest 2.4.2 release. I guess for now, DNSBL has to be turned off it stops my ability to reach any sites not already in cache.

akong

I also show bad 502.I have upgrade 2.4.1 and latest pfblockerng.What's this problem?

steky9

@steky9:

@BBcan177:

@PiBa:

@steky9:

Happened again late last night. This time got the logs requested
https://pastebin.com/GMZG8B6H

What strikes me as odd here (and maybe unrelated to pfBlocker) is the 182 running 'vnstat' processes.. A possible source would be from TrafficTotals package, can you confirm you have got that installed?

Yes I saw this too on other machines where this is occurring… I wish I could find the trigger for it... Lets see if anyone chimes in that they have TrafficTotals pkg installed, and maybe try to disable the selected Interfaces in that pkg to see what that does...

I didn't really pay much/any attention to its output, so I've uninstalled it to see if it makes any difference. Have checked and after uninstall there's no instance of vnstat running.

Well that didn't fix it. Same thing happened Thursday night, only got to take the logs off it now

https://pastebin.com/xeQPS9eq

martial

Thanks really helpful topic for this issue

kyvpn

@BBcan177:

@PiBa:

@steky9:

Happened again late last night. This time got the logs requested
https://pastebin.com/GMZG8B6H

What strikes me as odd here (and maybe unrelated to pfBlocker) is the 182 running 'vnstat' processes.. A possible source would be from TrafficTotals package, can you confirm you have got that installed?

Yes I saw this too on other machines where this is occurring… I wish I could find the trigger for it... Lets see if anyone chimes in that they have TrafficTotals pkg installed, and maybe try to disable the selected Interfaces in that pkg to see what that does...

I had TrafficTotals running and would get the 502 after 3-4 days, removed it based on this post and I'm up 8days22hrs so far.

2.4.1, pfBlockerNG 2.1.2_1

akong

I has remove Status_Traffic_Totals package.But it's always show bad 502 up to 4days.I don't know what is this problem.

steky9

If anything removing TrafficTotals has made things worse rather than better. I only rebooted on Sunday night to get management back, and now 48 hours later I'm getting the 502's again. Maybe its just a freak occurence, I don't know, but as is somethings badly broken.

PiBa

From what i 'think' happens TrafficTotals does not cause the problem. But might experience the same symptom as pfBlocker..

For those using TrafficTotals and experiencing the problem it would be nice to get some information in 'why' the vnstat process hangs during a set of actions mostly unrelated to what pfBlocker does as they might have the same root cause for 'hanging'.. So truss, lsof and possibly gdb output would be nice to see especially as its a easy separated process unlike pfBlocker/lighttpd/php chain thats harder to run separately. Also it would be good to see if vnstat still hangs when gathering stats for less and or different interfaces.. Both while there are already hanging vnstat processes, gather details, and after killing all those processes try if it still hangs. (without rebooting..)

Yes 'something' is broken. but only a +1 wont help fix it.. i think its already high on the attention list of BBcan177, and i'm interested in this topic as well and probably a few others that passively 'monitor' this thread, but i doubt it can be properly fixed without detailed information and a good understanding of why the problem happens.

Please gather information some about running vnstat processes (when more than 1 starts running.) for those that have TrafficTotals installed. Preferably on pfSense 2.4.2 though not sure if that would help for anything..

steky9

I'm happy to help if any more command output is required. I haven't rebooted it yet since the 502's started again on Tuesday. Given the day thats in it, I'll leave it be unless it starts dropping traffic.

Corbinm3

We were also having issues with 502 Bad Gateway, 2.4.0 release, PFBlockerNG, Snort, OpenVPN Exporter…I noticed our issues after enabling DNS Resolver. Maybe it is just a coincidence but not even 30 minutes after turning that on and we got 502 errors. Rebooted, disabled PFBlockerNG, same problem the following day. Rebooted again, switched back to DNS forwarder and uninstalled PFBlockerNG, been stable since. Without the DNS resolver enabled we were stable with PFBlockerNG installed for over a week. After enabling the DNS Resolver, we went down quick. I'll keep this forum up to date if we do go down again and I have to rule out the DNS Resolver as the culprit, but for now, that's what it looks like from our end.

Edit: Forgot to post this is on Netgate hardware, can't remember which one though and I'm not in the office.

PiBa

For those willing to give some new code a try i have made a few changes to the 'file locking' code of pfBlockerNG.. :)
Could some of you try if the changes made improve things?

https://github.com/PiBa-NL/FreeBSD-ports/commit/1766713b26c8f388ad6e7909b2e971f7d74cdfea

Changes are as following:

include globals.inc so the /tmp/ folder is know to be used for placing lock files instead of the root /
dont try and lock a resource handle with try_lock as a 'resource-(descriptive)-name' is expected
use 1 lock around the stats file re-writing code, having 2 locks for the same piece of code is not needed.
remove the force_unlock called on a 'Resource #10' which wasn't used to create a lock anyhow..

It should be possible to apply the patch with systempatches package.
To add a new patch that way press add then fill in:
Description: pfBlocker_dnsbl_statsfile_locking
File: https://github.com/PiBa-NL/FreeBSD-ports/commit/1766713b26c8f388ad6e7909b2e971f7d74cdfea.patch
PathStrip: 4
Base: /
IgnoreWhitespace: Checked
AutoApply: Unchecked

Save, Fetch, Apply

A message should show "Patch applied successfully".

To revert it should be possible to just press 'Revert' which appears after the patch is applied.. If all fails, reinstall pfBlocker package "pkg install -f pfSense-pkg-pfBlockerNG"

Edit :
FYI: pfBlocker 2.1.2_2 includes this patch.

dstroot

Hmm… test output is not inspiring confidence. Patch test output:

/usr/bin/patch --directory=/ -f -p4 -i /var/patches/5a17809ef2593.patch --check --reverse --ignore-whitespace

Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 1766713b26c8f388ad6e7909b2e971f7d74cdfea Mon Sep 17 00:00:00 2001
|From: PiBa-NL
|Date: Fri, 24 Nov 2017 01:37:34 +0100
|Subject: [PATCH] pfBlockerNG, implement proper locking of dnsbl_info file to
| avoid possible corruption
|
|–-
| .../usr/local/pkg/pfblockerng/pfblockerng.inc      | 30 ++++++++-----------
| .../files/usr/local/www/pfblockerng/www/index.php  | 35 ++++++++++------------
| 2 files changed, 27 insertions(+), 38 deletions(-)
|
|diff --git a/net/pfSense-pkg-pfBlockerNG/files/usr/local/pkg/pfblockerng/pfblockerng.inc b/net/pfSense-pkg-pfBlockerNG/files/usr/local/pkg/pfblockerng/pfblockerng.inc
|index 0fddd745065b..c6379b8dab38 100644
|--- a/net/pfSense-pkg-pfBlockerNG/files/usr/local/pkg/pfblockerng/pfblockerng.inc
|+++ b/net/pfSense-pkg-pfBlockerNG/files/usr/local/pkg/pfblockerng/pfblockerng.inc
--------------------------
Patching file usr/local/pkg/pfblockerng/pfblockerng.inc using Plan A...
Hunk #1 failed at 2500.
1 out of 1 hunks failed while patching usr/local/pkg/pfblockerng/pfblockerng.inc
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/net/pfSense-pkg-pfBlockerNG/files/usr/local/www/pfblockerng/www/index.php b/net/pfSense-pkg-pfBlockerNG/files/usr/local/www/pfblockerng/www/index.php
|index 0b864797146e..8992f4a0342f 100644
|--- a/net/pfSense-pkg-pfBlockerNG/files/usr/local/www/pfblockerng/www/index.php
|+++ b/net/pfSense-pkg-pfBlockerNG/files/usr/local/www/pfblockerng/www/index.php
--------------------------
Patching file usr/local/www/pfblockerng/www/index.php using Plan A...
Hunk #1 failed at 28.
Hunk #2 failed at 71.
2 out of 2 hunks failed while patching usr/local/www/pfblockerng/www/index.php
done

PiBa

dstroot, are you running latest/unmodified pfBlockerNG 2.1.2_1 version? On that version, the patch above should apply cleanly.

dstroot

Yes, see attached. Cheers!

firewall_home_lan_-_System__Package_Manager__Installed_Packages.png

PiBa

Wierd, can you reinstall it? 'pkg install -f pfSense-pkg-pfBlockerNG'
Same patch applies without issue on my 2.1.2_1, you havn't replaced anything with one of the previous files from bbcan's links or manually changed any part?

Or did you check the 'revert' test results? Below would be the expected test result:

Patch can be applied cleanly (detail)
Patch can NOT be reverted cleanly (detail)

Revert only works after the patch is applied already.

dstroot

I think the "Can NOT be reverted cleanly" through me off. I just checked and mine and got the results you show so I applied the patch and it applied successfully. I will report if the 502s go away. Cheers!

fortrash

Same error here. It is quite annoying as my pfsense installation ran smoothly. Since 2.4 I have to schedule reboots.
Any workaround except commenting out the code?
Are the developer working on it? Otherwise I do test the competitor product.

Thanks,

PiBa

Fortrash, please try the patch: https://forum.pfsense.org/index.php?topic=137103.msg767259#msg767259

fortrash

Thanks any chance to help the developer?